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Porting 2nd 201T with newer piston.

NorcalFlyingsquirrel

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So I am porting my 2nd 201t saw and began with a Mastermind less is more approach (1st one I took .04 out and cut off extension). I am still going to finish this one 1st gen to see how it goes with just a wee cut and ditched gasket, transfer cleanout, ex and intake widening, but then my buddy hands me a 2nd gen piston and once I grind up a custom squish cutter you know where this is going... 20220329_123217.jpg
 

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The transfer nipple is the limiting factor. Without a base cut there’s only about 0.010” to be removed from the chamber before squish gets too big again. Maybe the nipple could be cut off and installed in the case?

The new pistons are cool, but they do require a fancy squish cut. Alternatively you could do a flat cut and then trim the new popup to fit.

Next one across my bench will get 0.025” off the base, fancy squish cut at 0.016” and intake raised back to stock (the strato makes this tricky). Plus slightly shorter blowdown.
 

NorcalFlyingsquirrel

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The transfer nipple is the limiting factor. Without a base cut there’s only about 0.010” to be removed from the chamber before squish gets too big again. Maybe the nipple could be cut off and installed in the case?

The new pistons are cool, but they do require a fancy squish cut. Alternatively you could do a flat cut and then trim the new popup to fit.

Next one across my bench will get 0.025” off the base, fancy squish cut at 0.016” and intake raised back to stock (the strato makes this tricky). Plus slightly shorter blowdown.
I whacked the nipple off my last build and .04 off the band and squish and case matched the bottom of the transfer and it is super snappy like a 200 and has lots of torque. I only widened the ex and intake but I am tempted to square that v in the piston which would put the intake wfo at 85 instead of . Wouldnt you want to raise the intake and stratos (Pita) with some epoxy for torque? More case compression?
 

NorcalFlyingsquirrel

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I am hoping that with nothing off the base that popup will raise compression quite a bit so I can have an easier workflow. It looks like that pop is going to fill a lot of area, and keep that high intake. Fun stuff.
 

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That’s almost exactly what I did last time. It ran nice but not amazing. I think it needs more compression.
 

NorcalFlyingsquirrel

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That’s almost exactly what I did last time. It ran nice but not amazing. I think it needs more compression.
Thanks for saving me time.The one I whacked .04 off is impressive, Feels snappier than a high comp 200. Maybe if I jb the intake and stratos Ill get a little more torque. I should try it on a non mtronic cause it could be that little mt bog. When you lean on it it kinda stalls then picks up and pulls. Ill do that tomorrow and report back.
 

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Hold on, I mis-spoke. There’s a difference with what I did. The last saw I was working on was a V2. The chamber was shaped for the popup piston. I set squish at 0.016”, but that only dropped the jug 0.008” (I made a thinner gasket). It’s possible putting a V2 piston in a V1 jug will create more compression. The shapes don’t match, but you will be filling more space. I have a feeling it still won’t make tons of compression (the V1 chamber looks larger) but I would try it first.
 

NorcalFlyingsquirrel

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Hold on, I mis-spoke. There’s a difference with what I did. The last saw I was working on was a V2. The chamber was shaped for the popup piston. I set squish at 0.016”, but that only dropped the jug 0.008” (I made a thinner gasket). It’s possible putting a V2 piston in a V1 jug will create more compression. The shapes don’t match, but you will be filling more space. I have a feeling it still won’t make tons of compression (the V1 chamber looks larger) but I would try it first.
Sweet, Thats good to hear theres a lot of meat in the off center version 1, I should end up with a smallish chamber and close to stock timing. The pop is .044 so In theory if I shape my cutter right I should get close to what I have on the chopped flat top but keep the transfer velocity and intake timing for more torque. pita for science. And whacking off...
 

NorcalFlyingsquirrel

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Sweet, Thats good to hear theres a lot of meat in the off center version 1, I should end up with a smallish chamber and close to stock timing. The pop is .044 so In theory if I shape my cutter right I should get close to what I have on the chopped flat top but keep the transfer velocity and intake timing for more torque. pita for science. And whacking off...
Well I just reassembled and tried the ditch the gasket, cut .010, opened transfers intake and exhaust with a flat top and it is pretty strong. Definitely has tons of torque. Ill have to do some cant racing tomorrow vs the other one and see what happens. I think that with the newer piston and a tight angled cut It would definitely be the icing on the cake.
 

NorcalFlyingsquirrel

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Theres the wash pattern from the first port, going to touch up that one 2ndary. Then my new style cutter and the finished chamber cut. I ended up with even .030 squish, guess Ill run it
and if its not enough comp ill
20220414_214345.jpg 20220415_000037.jpg take .015 off the base. It was tricky cause it wants to cut much deeper on the intake side because of the offset cumbustion chamber so I went a little past my desired depth truing things up.
 

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